[PATCH 0/3] mmc: core: Add SD Discard support

From: Avri Altman
Date: Sun Feb 03 2019 - 03:50:58 EST

D spec v5.1 adds discard support. The flows and commands matches those
in eMMC, Which leaves to set the appropriate discard arg in CMD38 if
DISCARD_SUPPORT (b313) is set in the SD_STATUS register.

We set this arg on card init: not in mmc_init_erase as one might expect
but arbitrarily once the card indicated its discard support. This is
because unlike erase, it doesn't really involve any logic, and we want
to avoid the unnecessary complication.

Avri Altman (3):
mmc: core: Calculate the discard arg only once
mmc: core: Indicate SD specs higher than 4.0
mmc: core: Add discard support to sd

drivers/mmc/core/block.c | 12 +++---------
drivers/mmc/core/core.c | 6 +++++-
drivers/mmc/core/mmc.c | 8 ++++++++
drivers/mmc/core/sd.c | 15 +++++++++++++++
include/linux/mmc/card.h | 4 ++++
include/linux/mmc/sd.h | 6 ++++++
6 files changed, 41 insertions(+), 10 deletions(-)